It is simple to see why that stat is useless.
Rossi raced with none of the aliens from 2000-2005
Pedrosa and Stoner joined the fray from 2006-2008 and the three challenged each other
Then Lorenzo joined in 08 and we had four aliens.
I am not going to do the research but if we had an a average from 08-12 then we may have something.